Halohydrin Formation from an Alkene

This step is the same as for haiogen addition to an aikene (see Section 8.12A). 

however, a water molecule acts as the nucleophile and attacks a carbon of the proton (it is transferred to a ring, causing the formation of a molecule of water). This step 

The first step is the same as that for halogen addition. In the second step, however, the two mechanisms differ. In halohydrin formation, water acts as the nucleophile and attacks one carbon atom of the halonium ion. The three-membered ring opens, and a protonated halohydrin is produced. Loss of a proton then leads to the formation of the halohydrin itself. 

Review Problem 8.15 Write a mechanism to explain the following reaction. 

When ethene gas is passed into an aqueous solution containing bromine and sodium chloride, the products of the reaction are the following  

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A MECHANISM FOR THE REACTION ] Halohydrin Formation from an Alkene 365... 

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